<template>
	<view class="mpvue-picker">
		<view :class="{'pickerMask':showPicker}" @click="maskClick" catchtouchmove="true"></view>
		<view class="mpvue-picker-content " :class="{'mpvue-picker-view-show':showPicker}">
			<view class="mpvue-picker__hd" catchtouchmove="true">
				<view class="mpvue-picker__action" @click="pickerCancel">取消</view>
				<view class="mpvue-picker__action" :style="{color:themeColor}" @click="pickerConfirm">确定</view>
			</view>
			<!-- 单列 -->
			<picker-view indicator-style="height: 40px;" class="mpvue-picker-view" :value="pickerValue"
				@change="pickerChange" v-if="mode==='selector' && pickerValueSingleArray.length > 0">
				<picker-view-column>
					<view class="picker-item" v-for="(item,index) in pickerValueSingleArray" :key="index">{{item.label}}
					</view>
				</picker-view-column>
			</picker-view>
			<!-- 时间选择器 -->
			<picker-view indicator-style="height: 40px;" class="mpvue-picker-view" :value="pickerValue"
				@change="pickerChange" v-if="mode==='timeSelector'">
				<picker-view-column>
					<view class="picker-item" v-for="(item,index) in pickerValueHour" :key="index">{{item.label}}</view>
				</picker-view-column>
				<picker-view-column>
					<view class="picker-item" v-for="(item,index) in pickerValueMinute" :key="index">{{item.label}}
					</view>
				</picker-view-column>
			</picker-view>
			<!-- 多列选择 -->
			<picker-view indicator-style="height: 40px;" class="mpvue-picker-view" :value="pickerValue"
				@change="pickerChange" v-if="mode==='multiSelector'">
				<!-- #ifdef VUE3 -->
				<template v-for="(n,index) in pickerValueMulArray.length" :key="index">
					<picker-view-column>
						<view class="picker-item" v-for="(item,index1) in pickerValueMulArray[n]" :key="index1">
							{{item.label}}
						</view>
					</picker-view-column>
				</template>
				<!-- #endif -->
				<!-- #ifndef VUE3 -->
				<block v-for="(n,index) in pickerValueMulArray.length" :key="index">
					<picker-view-column>
						<view class="picker-item" v-for="(item,index1) in pickerValueMulArray[n]" :key="index1">
							{{item.label}}
						</view>
					</picker-view-column>
				</block>
				<!-- #endif -->
			</picker-view>
			<!-- 二级联动 -->
			<picker-view indicator-style="height: 40px;" class="mpvue-picker-view" :value="pickerValue"
				@change="pickerChangeMul" v-if="mode==='multiLinkageSelector' && deepLength===2">
				<picker-view-column>
					<view class="picker-item" v-for="(item,index) in pickerValueMulTwoOne" :key="index">{{item.label}}
					</view>
				</picker-view-column>
				<picker-view-column>
					<view class="picker-item" v-for="(item,index) in pickerValueMulTwoTwo" :key="index">{{item.label}}
					</view>
				</picker-view-column>
			</picker-view>
			<!-- 三级联动 -->
			<picker-view indicator-style="height: 40px;" class="mpvue-picker-view" :value="pickerValue"
				@change="pickerChangeMul" v-if="mode==='multiLinkageSelector' && deepLength===3">
				<picker-view-column>
					<view class="picker-item" v-for="(item,index) in pickerValueMulThreeOne" :key="index">{{item.label}}
					</view>
				</picker-view-column>
				<picker-view-column>
					<view class="picker-item" v-for="(item,index) in pickerValueMulThreeTwo" :key="index">{{item.label}}
					</view>
				</picker-view-column>
				<picker-view-column>
					<view class="picker-item" v-for="(item,index) in pickerValueMulThreeThree" :key="index">
						{{item.label}}
					</view>
				</picker-view-column>
			</picker-view>
		</view>
	</view>
</template>

<script>
	export default {
		data() {
			return {
				pickerChangeValue: [],
				pickerValue: [],
				pickerValueArrayChange: true,
				modeChange: false,
				pickerValueSingleArray: [],
				pickerValueHour: [],
				pickerValueMinute: [],
				pickerValueMulArray: [],
				pickerValueMulTwoOne: [],
				pickerValueMulTwoTwo: [],
				pickerValueMulThreeOne: [],
				pickerValueMulThreeTwo: [],
				pickerValueMulThreeThree: [],
				/* 是否显示控件 */
				showPicker: false,
			};
		},
		props: {
			/* mode */
			mode: {
				type: String,
				default: 'selector'
			},
			/* picker 数值 */
			pickerValueArray: {
				type: Array,
				default () {
					return []
				}
			},
			/* 默认值 */
			pickerValueDefault: {
				type: Array,
				default () {
					return []
				}
			},
			/* 几级联动 */
			deepLength: {
				type: Number,
				default: 2
			},
			/* 主题色 */
			themeColor: String
		},
		watch: {
			pickerValueArray(oldVal, newVal) {
				this.pickerValueArrayChange = true;
			},
			mode(oldVal, newVal) {
				this.modeChange = true;
			},
			pickerValueArray(val) {
				this.initPicker(val);
			}
		},
		methods: {
			initPicker(valueArray) {
				let pickerValueArray = valueArray;
				this.pickerValue = this.pickerValueDefault;
				// 初始化多级联动
				if (this.mode === 'selector') {
					this.pickerValueSingleArray = valueArray;
				} else if (this.mode === 'timeSelector') {
					this.modeChange = false;
					let hourArray = [];
					let minuteArray = [];
					for (let i = 0; i < 24; i++) {
						hourArray.push({
							value: i,
							label: i > 9 ? `${i} 时` : `0${i} 时`
						});
					}
					for (let i = 0; i < 60; i++) {
						minuteArray.push({
							value: i,
							label: i > 9 ? `${i} 分` : `0${i} 分`
						});
					}
					this.pickerValueHour = hourArray;
					this.pickerValueMinute = minuteArray;
				} else if (this.mode === 'multiSelector') {
					this.pickerValueMulArray = valueArray;
				} else if (this.mode === 'multiLinkageSelector' && this.deepLength === 2) {
					// 两级联动
					let pickerValueMulTwoOne = [];
					let pickerValueMulTwoTwo = [];
					// 第一列
					for (let i = 0, length = pickerValueArray.length; i < length; i++) {
						pickerValueMulTwoOne.push(pickerValueArray[i]);
					}
					// 渲染第二列
					// 如果有设定的默认值
					if (this.pickerValueDefault.length === 2) {
						let num = this.pickerValueDefault[0];
						for (
							let i = 0, length = pickerValueArray[num].children.length; i < length; i++
						) {
							pickerValueMulTwoTwo.push(pickerValueArray[num].children[i]);
						}
					} else {
						for (
							let i = 0, length = pickerValueArray[0].children.length; i < length; i++
						) {
							pickerValueMulTwoTwo.push(pickerValueArray[0].children[i]);
						}
					}
					this.pickerValueMulTwoOne = pickerValueMulTwoOne;
					this.pickerValueMulTwoTwo = pickerValueMulTwoTwo;
				} else if (
					this.mode === 'multiLinkageSelector' &&
					this.deepLength === 3
				) {
					let pickerValueMulThreeOne = [];
					let pickerValueMulThreeTwo = [];
					let pickerValueMulThreeThree = [];
					// 第一列
					for (let i = 0, length = pickerValueArray.length; i < length; i++) {
						pickerValueMulThreeOne.push(pickerValueArray[i]);
					}
					// 渲染第二列
					this.pickerValueDefault =
						this.pickerValueDefault.length === 3 ?
						this.pickerValueDefault : [0, 0, 0];
					if (this.pickerValueDefault.length === 3) {
						let num = this.pickerValueDefault[0];
						for (
							let i = 0, length = pickerValueArray[num].children.length; i < length; i++
						) {
							pickerValueMulThreeTwo.push(pickerValueArray[num].children[i]);
						}
						// 第三列
						let numSecond = this.pickerValueDefault[1];
						for (let i = 0, length = pickerValueArray[num].children[numSecond].children.length; i <
							length; i++) {
							pickerValueMulThreeThree.push(
								pickerValueArray[num].children[numSecond].children[i]
							);
						}
					}
					this.pickerValueMulThreeOne = pickerValueMulThreeOne;
					this.pickerValueMulThreeTwo = pickerValueMulThreeTwo;
					this.pickerValueMulThreeThree = pickerValueMulThreeThree;
				}
			},
			show() {
				setTimeout(() => {
					if (this.pickerValueArrayChange || this.modeChange) {
						this.initPicker(this.pickerValueArray);
						this.showPicker = true;
						this.pickerValueArrayChange = false;
						this.modeChange = false;
					} else {
						this.showPicker = true;
					}
				}, 0);
			},
			maskClick() {
				this.pickerCancel();
			},
			pickerCancel() {
				this.showPicker = false;
				this._initPickerVale();
				let pickObj = {
					index: this.pickerValue,
					value: this._getPickerLabelAndValue(this.pickerValue, this.mode).value,
					label: this._getPickerLabelAndValue(this.pickerValue, this.mode).label
				};
				this.$emit('onCancel', pickObj);
			},
			pickerConfirm(e) {
				this.showPicker = false;
				this._initPickerVale();
				let pickObj = {
					index: this.pickerValue,
					value: this._getPickerLabelAndValue(this.pickerValue, this.mode).value,
					label: this._getPickerLabelAndValue(this.pickerValue, this.mode).label
				};
				this.$emit('onConfirm', pickObj);
			},
			showPickerView() {
				this.showPicker = true;
			},
			pickerChange(e) {
				this.pickerValue = e.mp.detail.value;
				let pickObj = {
					index: this.pickerValue,
					value: this._getPickerLabelAndValue(this.pickerValue, this.mode).value,
					label: this._getPickerLabelAndValue(this.pickerValue, this.mode).label
				};
				this.$emit('onChange', pickObj);
			},
			pickerChangeMul(e) {
				if (this.deepLength === 2) {
					let pickerValueArray = this.pickerValueArray;
					let changeValue = e.mp.detail.value;
					// 处理第一列滚动
					if (changeValue[0] !== this.pickerValue[0]) {
						let pickerValueMulTwoTwo = [];
						// 第一列滚动第二列数据更新
						for (let i = 0, length = pickerValueArray[changeValue[0]].children.length; i < length; i++) {
							pickerValueMulTwoTwo.push(pickerValueArray[changeValue[0]].children[i]);
						}
						this.pickerValueMulTwoTwo = pickerValueMulTwoTwo;
						// 第二列初始化为 0
						changeValue[1] = 0;
					}
					this.pickerValue = changeValue;
				} else if (this.deepLength === 3) {
					let pickerValueArray = this.pickerValueArray;
					let changeValue = e.mp.detail.value;
					let pickerValueMulThreeTwo = [];
					let pickerValueMulThreeThree = [];
					// 重新渲染第二列
					// 如果是第一列滚动
					if (changeValue[0] !== this.pickerValue[0]) {
						this.pickerValueMulThreeTwo = [];
						for (let i = 0, length = pickerValueArray[changeValue[0]].children.length; i < length; i++) {
							pickerValueMulThreeTwo.push(pickerValueArray[changeValue[0]].children[i]);
						}
						// 重新渲染第三列
						for (let i = 0, length = pickerValueArray[changeValue[0]].children[0].children.length; i <
							length; i++) {
							pickerValueMulThreeThree.push(pickerValueArray[changeValue[0]].children[0].children[i]);
						}
						changeValue[1] = 0;
						changeValue[2] = 0;
						this.pickerValueMulThreeTwo = pickerValueMulThreeTwo;
						this.pickerValueMulThreeThree = pickerValueMulThreeThree;
					} else if (changeValue[1] !== this.pickerValue[1]) {
						// 第二列滚动
						// 重新渲染第三列
						this.pickerValueMulThreeThree = [];
						pickerValueMulThreeTwo = this.pickerValueMulThreeTwo;
						for (let i = 0, length = pickerValueArray[changeValue[0]].children[changeValue[1]].children
								.length; i <
							length; i++) {
							pickerValueMulThreeThree.push(pickerValueArray[changeValue[0]].children[changeValue[1]]
								.children[
									i]);
						}
						changeValue[2] = 0;
						this.pickerValueMulThreeThree = pickerValueMulThreeThree;
					}
					this.pickerValue = changeValue;
				}
				let pickObj = {
					index: this.pickerValue,
					value: this._getPickerLabelAndValue(this.pickerValue, this.mode).value,
					label: this._getPickerLabelAndValue(this.pickerValue, this.mode).label
				};
				this.$emit('onChange', pickObj);
			},
			// 获取 pxikerLabel
			_getPickerLabelAndValue(value, mode) {
				let pickerLable;
				let pickerGetValue = [];
				// selector
				if (mode === 'selector') {
					pickerLable = this.pickerValueSingleArray[value].label;
					pickerGetValue.push(this.pickerValueSingleArray[value].value);
				} else if (mode === 'timeSelector') {
					pickerLable = `${this.pickerValueHour[value[0]].label}-${this.pickerValueMinute[value[1]].label}`;
					pickerGetValue.push(this.pickerValueHour[value[0]].value);
					pickerGetValue.push(this.pickerValueHour[value[1]].value);
				} else if (mode === 'multiSelector') {
					for (let i = 0; i < value.length; i++) {
						if (i > 0) {
							pickerLable += this.pickerValueMulArray[i][value[i]].label + (i === value.length - 1 ? '' :
								'-');
						} else {
							pickerLable = this.pickerValueMulArray[i][value[i]].label + '-';
						}
						pickerGetValue.push(this.pickerValueMulArray[i][value[i]].value);
					}
				} else if (mode === 'multiLinkageSelector') {
					/* eslint-disable indent */
					pickerLable =
						this.deepLength === 2 ?
						`${this.pickerValueMulTwoOne[value[0]].label}-${this.pickerValueMulTwoTwo[value[1]].label}` :
						`${this.pickerValueMulThreeOne[value[0]].label}-${this.pickerValueMulThreeTwo[value[1]].label}-${this.pickerValueMulThreeThree[value[2]].label}`;
					if (this.deepLength === 2) {
						pickerGetValue.push(this.pickerValueMulTwoOne[value[0]].value);
						pickerGetValue.push(this.pickerValueMulTwoTwo[value[1]].value);
					} else {
						pickerGetValue.push(this.pickerValueMulThreeOne[value[0]].value);
						pickerGetValue.push(this.pickerValueMulThreeTwo[value[1]].value);
						pickerGetValue.push(this.pickerValueMulThreeThree[value[2]].value);
					}
					/* eslint-enable indent */
				}
				return {
					label: pickerLable,
					value: pickerGetValue
				};
			},
			// 初始化 pickerValue 默认值
			_initPickerVale() {
				if (this.pickerValue.length === 0) {
					if (this.mode === 'selector') {
						this.pickerValue = [0];
					} else if (this.mode === 'multiSelector') {
						this.pickerValue = new Int8Array(this.pickerValueArray.length);
					} else if (
						this.mode === 'multiLinkageSelector' &&
						this.deepLength === 2
					) {
						this.pickerValue = [0, 0];
					} else if (
						this.mode === 'multiLinkageSelector' &&
						this.deepLength === 3
					) {
						this.pickerValue = [0, 0, 0];
					}
				}
			}
		}
	};
</script>

<style>
	.pickerMask {
		position: fixed;
		z-index: 1000;
		top: 0;
		right: 0;
		left: 0;
		bottom: 0;
		background: rgba(0, 0, 0, 0.6);
	}

	.mpvue-picker-content {
		position: fixed;
		bottom: 0;
		left: 0;
		width: 100%;
		transition: all 0.3s ease;
		transform: translateY(100%);
		z-index: 3000;
	}

	.mpvue-picker-view-show {
		transform: translateY(0);
	}

	.mpvue-picker__hd {
		display: flex;
		padding: 9px 15px;
		background-color: #fff;
		position: relative;
		text-align: center;
		font-size: 17px;
	}

	.mpvue-picker__hd:after {
		content: ' ';
		position: absolute;
		left: 0;
		bottom: 0;
		right: 0;
		height: 1px;
		border-bottom: 1px solid #e5e5e5;
		color: #e5e5e5;
		transform-origin: 0 100%;
		transform: scaleY(0.5);
	}

	.mpvue-picker__action {
		display: block;
		flex: 1;
		color: #1aad19;
	}

	.mpvue-picker__action:first-child {
		text-align: left;
		color: #888;
	}

	.mpvue-picker__action:last-child {
		text-align: right;
	}

	.picker-item {
		text-align: center;
		line-height: 40px;
		font-size: 16px;
	}

	.mpvue-picker-view {
		position: relative;
		bottom: 0;
		left: 0;
		width: 100%;
		height: 238px;
		background-color: rgba(255, 255, 255, 1);
	}
</style>
